Start at Level 16
A few button combinations can let you start the game with all of the characters at level 16. At the title screen, hold the "X" button instead of pushing "Start." When you hear a chime, select "New Game." If you're having difficulty, an alternative is to hold the "L" and "R" buttons as you hold "X." You will then see the "Save" screen and can select "New Game."
Maximum Levels and Stats
You will need two controllers to unlock a cheat that will start each character at Level 99 with 255 Stats. On the second player controller, hold the "A" button for the entire duration of your code input. On the first player controller, press "Up," "Up," "Down," "Down," "Left," "Left" and "Right." If that doesn't work, hold "A" on the second player controller, press "Up," "Up," "Down," "Down," "Left," "Left," "Right," "Right," "Up," "Down," "Left," "Right," "Up," "Down," "Left," "Right," "B," "X," "L" and "R."
Skip Battles
The game will give you a random enemy battle about every eight to 10 steps your characters take. When you find yourself low on energy, or need to replenish lost hit points, apply a cheat that extends the time between battles. At the seventh step, press "X" to open the stat menu and press "B" to cancel. You can now take another seven steps without encountering a battle.
Redoing Battles
Press "F2" on the computer version to save right before a battle begins. If you don't like how the battle goes, press "F4" to reload the battle from your last safe point.
Money Cheat
Computer players can tweak save files to increase their amount of saved game money to as much as 999,999. Once you've saved at least once, quit the game and open the save state file via the Hex Editor program. Open the "find" option ("CTRL" + "F") and type "2B29." Erase the code there and replace it with "3F 42 0F." Save the file.